Electrical circuits/apparatus disconnected from the power sources are considered?

Electrical circuits/apparatus disconnected from the power sources are considered?

• A. Safe to touch.
• B. Not hazardous if insulated.
• C. De-energized automatically.
• D. Dangerous to life until tested de-energized and properly grounded.

Answer: (D)

Even after a circuit or apparatus is disconnected from its power source, it must still be treated as potentially dangerous. Disconnection does not guarantee safety because stored energy can remain in capacitors or inductive components, batteries can hold a charge, and other parts of the system or nearby circuits can backfeed or maintain voltage. To work safely, you must follow lockout/tagout procedures, verify absence of voltage with a properly rated test device, and ensure any stored energy is discharged and the equipment is properly grounded before touching. Only then is it safe to proceed.

Even after a circuit or apparatus is disconnected from its power source, it must still be treated as potentially dangerous. Disconnection does not guarantee safety because stored energy can remain in capacitors or inductive components, batteries can hold a charge, and other parts of the system or nearby circuits can backfeed or maintain voltage. To work safely, you must follow lockout/tagout procedures, verify absence of voltage with a properly rated test device, and ensure any stored energy is discharged and the equipment is properly grounded before touching. Only then is it safe to proceed.